Wesley:
Weren't these boards tested by your board supplier? Electrical testing
should have failed the boards with the open vias . The vias may have voids
due to bad drilling and deburring which may clog the hole, poor smear
removal or malfunction of the electroless copper line-trapped air or could
be plating voids. Cross section of the open vias should pinpoint the
problem.

Sona
Fineline Circuits Inc.

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